api: Implement CopyObject s3 API, doing server side copy.

Fixes #1172

pkg/fs/fs-bucket-listobjects.go

@@ -103,10 +103,10 @@ func (fs Filesystem) listObjects(bucket, prefix, marker, delimiter string, maxKe
 			objectName := strings.TrimPrefix(path, bucketPathPrefix)
 			if strings.HasPrefix(objectName, prefix) {
 				object := ObjectMetadata{
-					Object:  objectName,
-					Created: info.ModTime(),
-					Mode:    info.Mode(),
-					Size:    info.Size(),
+					Object:       objectName,
+					LastModified: info.ModTime(),
+					Mode:         info.Mode(),
+					Size:         info.Size(),
 				}
 				select {
 				// Send object on walker channel.

pkg/fs/fs-datatypes.go

@@ -33,11 +33,11 @@ type ObjectMetadata struct {
 	Bucket string
 	Object string
 
-	ContentType string
-	Created     time.Time
-	Mode        os.FileMode
-	MD5         string
-	Size        int64
+	ContentType  string
+	LastModified time.Time
+	Mode         os.FileMode
+	MD5          string
+	Size         int64
 }
 
 // PartMetadata - various types of individual part resources

pkg/fs/fs-multipart.go

@@ -546,12 +546,12 @@ func (fs Filesystem) CompleteMultipartUpload(bucket, object, uploadID string, da
 		}
 	}
 	newObject := ObjectMetadata{
-		Bucket:      bucket,
-		Object:      object,
-		Created:     st.ModTime(),
-		Size:        st.Size(),
-		ContentType: contentType,
-		MD5:         hex.EncodeToString(md5Hasher.Sum(nil)),
+		Bucket:       bucket,
+		Object:       object,
+		LastModified: st.ModTime(),
+		Size:         st.Size(),
+		ContentType:  contentType,
+		MD5:          hex.EncodeToString(md5Hasher.Sum(nil)),
 	}
 	return newObject, nil
 }

pkg/fs/fs-object.go

@@ -165,12 +165,12 @@ func getMetadata(rootPath, bucket, object string) (ObjectMetadata, *probe.Error)
 		}
 	}
 	metadata := ObjectMetadata{
-		Bucket:      bucket,
-		Object:      object,
-		Created:     stat.ModTime(),
-		Size:        stat.Size(),
-		ContentType: contentType,
-		Mode:        stat.Mode(),
+		Bucket:       bucket,
+		Object:       object,
+		LastModified: stat.ModTime(),
+		Size:         stat.Size(),
+		ContentType:  contentType,
+		Mode:         stat.Mode(),
 	}
 	return metadata, nil
 }
@@ -312,12 +312,12 @@ func (fs Filesystem) CreateObject(bucket, object, expectedMD5Sum string, size in
 		}
 	}
 	newObject := ObjectMetadata{
-		Bucket:      bucket,
-		Object:      object,
-		Created:     st.ModTime(),
-		Size:        st.Size(),
-		ContentType: contentType,
-		MD5:         md5Sum,
+		Bucket:       bucket,
+		Object:       object,
+		LastModified: st.ModTime(),
+		Size:         st.Size(),
+		ContentType:  contentType,
+		MD5:          md5Sum,
 	}
 	return newObject, nil
 }